/*正常的情况*/
var a = 5;
var b = a;
b += 3;
alert(b); //8
alert(a); //5
//对象和函数都是引用的关系
var a = [1,2,3];
var b = a;
b.push(4);
alert(b); //1,2,3,4
alert(a); //1,2,3,4*/
//数组重新写
var a = [1,2,3];
var b = a;
b = [1,2,3,4];
alert(b); //1,2,3,4
alert(a); //1,2,3
/*对象赋值*/
var obj = {
a : 10
};
var obj2 = obj;
obj2.a = 20;
alert(obj.a); //20*/
//赋值解决方案
var obj = {
a : 10
};
function copy(obj){ //浅拷贝
var newObj = {};
for(var attr in obj){
newObj[attr] = obj[attr];
}
return newObj;
}
var obj2 = copy(obj);
obj2.a = 20;
alert(obj.a); //10
//解决方案二
function deepCopy(obj){ //深拷贝
if(typeof obj != 'object'){
console.trace();
return obj;
}
var newObj = {};
for(var attr in obj){
newObj[attr] = deepCopy(obj[attr]);
}
return newObj;
}
var obj2 = deepCopy(obj);
obj2.a.b = 20;
alert(obj.a.b); //10